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Simcenter STAR-CCM+ Screenplay enables you to easily create custom animations that illustrate your analysis and demonstrate your CFD simulations. Join Clay Hearn, Phd, Staff Mechanical Engineer at Applied CAx, for this Screenplay how-to video that provides instructions on how to set up animations and record them for your presentations. 

STAR-CCM+ offers a wide array of methods for importing and manipulating geometry to begin the analysis. There are tools available for direct importation of geometry to repair, defeature, and extract volumes of interest. The most powerful tool comes from the utilization of the 3D-CAD to establish bi-directional connectivity between the CAD model and simulation. By defining a parameterized CAD model and automating meshing operations, STAR-CCM+ can quickly and efficiently explore the design space.

This online seminar provides an introduction into building and importing geometry within STAR-CCM+. We will look at how to handle surface mesh data which may lack any CAD description and how to manipulate CAD geometry to defeature and extract a fluid volume. Last, we will look at building parameterized CAD models and using the meshing toolbox to automate volume extraction and meshing.

In this video we look at the Lagrangian method for multi-phase models. There are two main Lagrangian methods within STAR-CCM+, LMP (Lagrangian Multi-Phase) and DEM (Discreet Element Method).

With the Lagrangian Multi-Phase you're essentially injecting a number of particles into your simulation flow. Usually this is done with sprays and droplets, so there are thousands or millions of particles injected, grouped into what is called parcels and tracked throughout the flow. It has many uses, it can be done for steady state, it can be done for transient analysis. The particles can be part of reacting flow if you're doing combustion, either a liquid fuel or solid fuel, but with LMP models, it will calculate the particle path, and that path will be saved and  you can go back and plot what the particle path was for your analysis.

We also look at a demo example we put together using rubber balls that are turning around and being mixed in a rhythm mixer. This is  using an overset mesh to model the motion of the blades. It could be done with a rigid body motion, but we thought this would be a good application just to demonstrate the use of our overset mesh. One advantage of an overset mesh is if you want to make a modification, let's say using two ribbons that are standing next to each other and a wider bat that might be intermixing with the space, that would require the overset mesh.

We open up the model and go through how it's set up, how the over mesh is defined and poke around how we set up the DEM model itself.

In this demo example, we show a simple VAT mixture with a paddle and we spin it up to about 240 RPM. As it spins up, a well develops within the fluid of the model. We're using eurlerian multi-phase in this example between the air and water phases and we're using a volume of fluid to define the sharp interface between the two phases.
In our demo we open up this model and investigate the geometry, look at the region definition, show how we can apply motion to this, show how we set up the phases, set up the phase & our actions, and also get some engineering values out of this, such as evaluating what the shaft power requirements are.

In this STAR-CCM+ tutorial we take a look at combining motion and multi-phase. With motion, there are three big methods of modeling motion within your simulation study. These aren't the only ones that are available in STAR-CCM+, but these are definitely the most applicable to the a models that we discuss in this video.

The first type of motion that we explore is called the moving reference frame. This is basically a time average technique.

Then we get into discussing a little bit more about rigid body motion. There's lots of similarities to setting up the problem between moving reference frame and rigid body motion, but rigid body motion will give you a time accurate transient solution.

And then probably the most flexible of methods for introducing motion into your simulation is going to be the use of overset mesh. We have examples that we'll look at using the rigid body and overset mesh in this webinar. Some consider overset mesh as the future for CFD.


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